[model_cards] facebook/bart-large-mnli: register ZSC for the inference API
[model_cards] facebook/bart-large-mnli: register ZSC for the inference API

cc @Narsil @mfuntowicz @joeddav

huggingface/transformers,huggingface/pytorch-transformers,huggingface/transformers,huggingface/transformers,huggingface/transformers